Whilst we're on the topic of eyewear, I should mention MOSCOT Eyewear and Eyecare, which has been a New York City institution for nearly 100 years. We're big on the round-frame trend which has most recently been revived by the charming criminal John Dillinger played by Johnny Depp in Public Enemies (2009). Alongside a huge variety of other styles, MOSCOT Eyewear really nails this lens shape. Offering both prescription and sunglass frames, the lenses are also available in a few interesting shades; such as a toxic green.
You can go shopping online and even "try on" a pair or two in cyberspace.